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A man swimming in a stream which flows `1(1)/(2)` km/hr finds that in a given time he can swim twice as far with the stream as he can against it. At what rate does he swim?

A

`5(1)/(2)km//hr`

B

`4(1)/(2)km//hr`

C

`7(1)/(2)km/hhr`

D

None of these

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The correct Answer is:
B
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